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Analog Devices Inc./Maxim Integrated MAX706TCUA+T
- Part No.:
- MAX706TCUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX706TCUA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,083
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Product details
Overview
MAX706TCUA+T from Maxim Integrated is an active-low microprocessor supervisory circuit in 8-pin µMAX package, providing reset generation (3.08V threshold), watchdog timer (1.6s timeout), power-fail warning (1.25V comparator), and manual-reset input for +3V/+3.3V systems. It ensures reliable boot-up and brownout recovery in battery-powered controllers and portable instrumentation.
For engineers reviewing the MAX706TCUA+T datasheet, MAX706TCUA+T pinout, MAX706TCUA+T application, or MAX706TCUA+T equivalent, this page delivers verified functional identity, validated pin roles, confirmed operating parameters across temperature, and real-world design implications for power-monitoring integrity and watchdog reliability.
Technical Context
The MAX706TCUA+T integrates a precision voltage monitor with 3.08V reset threshold (±1.5% tolerance), a 1.6s watchdog timer with WDI edge-triggered reset, and a dedicated 1.25V reference-based PFI/PFO comparator for external supply monitoring. Its RESET output asserts low when VCC drops below threshold or MR is pulled low, with guaranteed assertion down to VCC = 1V.
It operates over 0°C to +70°C, draws only 100µA quiescent current, and features TTL/CMOS-compatible MR input with debounced 200ms reset pulse width. The watchdog function remains enabled at all times - unlike AP/AR/AS/AT variants - and cannot be disabled via WDI floating state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (±1.5%) - precisely monitors +3.3V supply for brownout detection before system instability occurs |
| Reset Pulse Width | 200ms minimum - ensures sufficient hold time for full µP initialization after power stabilization |
| Watchdog Timeout | 1.6s - provides deterministic fail-safe response to firmware lockup without requiring external timing components |
| Supply Current | 100µA typical - enables long battery life in portable instruments and low-power embedded controllers |
| Power-Fail Threshold | 1.25V internal reference - allows configurable early-warning detection of unregulated rail collapse via resistive divider |
| Operating Voltage Range | 1.0V to 5.5V - guarantees RESET assertion even during deep undervoltage conditions down to VCC = 1V |
| Manual Reset Input | TTL/CMOS-compatible with 500ns minimum pulse width at 3V - supports pushbutton or logic-driven reset initiation |
Pinout & Package
MAX706TCUA+T is housed in an 8-pin µMAX package (U8-1), measuring 3mm × 3mm × 0.8mm, with exposed pad for thermal enhancement and lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | Pull low to initiate 200ms reset pulse; internally biased with 70µA current source; debounced by timing circuit |
| 2 (VCC) | Positive supply input | Accepts 1.0V–5.5V; powers all internal circuits including reset generator, watchdog, and comparator |
| 3 (GND) | Ground reference | Common return path for all analog and digital functions; required for accurate threshold comparison |
| 4 (PFI) | Power-fail comparator input | Monitors external voltage divider; asserts PFO when input falls below 1.25V reference |
| 5 (PFO) | Active-low power-fail output | Sinks current when PFI < 1.25V; used for early-warning interrupt or cascaded reset triggering |
| 6 (WDI) | Watchdog input | Edge-sensitive input; must toggle within 1.6s to prevent WDO assertion; no disable capability in T-suffix variant |
| 7 (RESET) | Active-low reset output | Drives µP reset pin low during power-up, brownout, or MR activation; holds low ≥200ms after recovery |
| 8 (WDO) | Active-low watchdog output | Asserts low on watchdog timeout or VCC undervoltage; deasserts immediately upon VCC recovery or WDI toggle |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset behavior during severe brownout or battery depletion, preventing undefined µP states |
| 200ms reset time delay | Provides consistent, factory-trimmed reset duration independent of external RC components or temperature drift |
| 1.25V precision PFI reference | Enables accurate, repeatable power-fail detection across supply rails (e.g., +12V, -3V) using simple resistor networks |
| 100µA quiescent current | Minimizes standby power draw in always-on battery applications such as handheld test equipment and remote sensors |
| Watchdog timer with 1.6s timeout | Delivers deterministic firmware supervision without software overhead or external timing elements |
Applications
| Battery-Powered Portable Instruments | Industrial Controller Power Monitoring |
|---|---|
Use Scenario: Handheld multimeter powered by single Li-ion cell with optional AC adapter. IC Role / Device Role / Timing Role: Supervisory IC monitors main +3.3V rail and triggers reset on battery sag or adapter disconnect. Use Value: Prevents corrupted measurements or EEPROM writes during undervoltage events using guaranteed 3.08V threshold and 200ms reset hold. |
Use Scenario: PLC I/O module operating from +24V DC converted to +3.3V and +5V rails. IC Role / Device Role / Timing Role: Resets microcontroller if +3.3V rail collapses due to load surge or regulator fault. Use Value: Eliminates need for discrete reset ICs and RC networks while ensuring immunity to short transients via hysteresis and precise threshold. |
| Embedded Computing Systems | Critical µP Power Monitoring |
Use Scenario: Fanless industrial PC with Intel Atom processor running from +3.3V supply. IC Role / Device Role / Timing Role: Provides primary reset signal and watchdog supervision for BIOS/firmware execution. Use Value: Guarantees clean boot sequence and detects firmware hangs via 1.6s watchdog, reducing field failures. |
Use Scenario: Medical diagnostic device requiring fail-safe power sequencing and brownout recovery. IC Role / Device Role / Timing Role: Monitors both main +3.3V rail and backup coin-cell voltage via PFI divider network. Use Value: Enables orderly shutdown and data preservation using PFO-triggered MR assertion before critical voltage loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706TEUA+ | Same functionality and pinout, but rated for -40°C to +85°C industrial temperature range | Required for extended-temperature deployments (e.g., outdoor telecom, automotive under-hood) | Select MAX706TEUA+ when ambient operating temperature exceeds +70°C |
| MAX706SCUA+ | Identical package and pinout, but 2.93V reset threshold instead of 3.08V | Suitable for systems where tighter margin above +3.3V nominal is needed (e.g., noisy 3.3V rails) | Choose MAX706SCUA+ when system requires earlier reset assertion during gradual 3.3V droop |
Compared with MAX706TEUA+, the MAX706TCUA+ offers lower cost and smaller inventory footprint for commercial-temperature applications, while MAX706SCUA+ provides a 150mV lower reset threshold for enhanced noise immunity on marginal 3.3V supplies - neither is pin-compatible with MAX706TCUA+ in terms of electrical behavior despite identical packaging.
Availability
MAX706TCUA+T is available at Aetrix Electronics and suitable for battery-powered equipment, portable instrumentation, and industrial controllers requiring stable component supply with guaranteed long-term sourcing.
Supply support for MAX706TCUA+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs high-performance analog and mixed-signal semiconductor solutions for power, sensing, and interface applications.
The MAX706 family targets cost-sensitive, space-constrained embedded systems needing integrated reset, watchdog, and power-fail monitoring - optimized for +3V/+3.3V µP platforms with minimal external components.
FAQ
What is the reset threshold voltage for MAX706TCUA+T?
The MAX706TCUA+T has a factory-trimmed reset threshold of 3.08V (±1.5%) with 20mV hysteresis. This value is specified for VCC falling conditions and ensures reliable detection of brownout on +3.3V systems. The threshold remains stable across the 0°C to +70°C operating range and is guaranteed down to VCC = 1V for fail-safe operation.
Does MAX706TCUA+T include a watchdog timer, and can it be disabled?
Yes, MAX706TCUA+T includes a 1.6s watchdog timer monitored via the WDI pin. Unlike the AP/AR/AS/AT variants, the watchdog function in the MAX706TCUA+T cannot be disabled - it remains active whenever VCC is within specification. A WDI transition must occur within 1.6s to prevent WDO assertion, and the timer resets on any WDI edge or RESET activation.
What is the purpose of the PFI and PFO pins on MAX706TCUA+T?
The PFI (Power-Fail Input) pin connects to a resistive divider monitoring an external supply (e.g., unregulated DC or negative rail), comparing it against an internal 1.25V reference. When PFI falls below 1.25V, the PFO (Power-Fail Output) pin goes low, enabling early-warning interrupts or cascaded reset generation. This allows MAX706TCUA+T to supervise multiple rails beyond its own VCC.
Can MAX706TCUA+T operate with a 1.8V supply?
No, MAX706TCUA+T requires a minimum VCC of 1.0V for RESET assertion but is not functional below 2.7V. Its absolute minimum operating voltage is 1.0V only for guaranteed reset output behavior; full supervisory functionality (including watchdog, PFI comparison, and valid logic levels) requires VCC ≥ 2.7V per datasheet specifications for the T-suffix variant.
Is MAX706TCUA+T pin-compatible with other MAX706 variants in the µMAX package?
Yes, all MAX706P/R/S/T and MAX706AP/AR/AS/AT variants in the 8-pin µMAX package (U8-1) share identical pinout and footprint. However, electrical behavior differs: MAX706TCUA+T provides active-low RESET and non-disableable watchdog, whereas AP/AR/AS/AT variants offer WDI disable capability and different reset thresholds - direct substitution requires validation of threshold and watchdog requirements.
MAX706TCUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX706TCUA+T FAQ
1.How can I place an order for MAX706TCUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706TCUA+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX706TCUA+T reliable?
The price and inventory of MAX706TCUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706TCUA+T is usually 5 days.
3.What payment methods are accepted for MAX706TCUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706TCUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706TCUA+T?
MAX706TCUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706TCUA+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX706TCUA+T?
For technical support, including MAX706TCUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706TCUA+T requirements.
6.How does Aetrix verify that MAX706TCUA+T is sourced from the original manufacturer or authorized distributors?
All MAX706TCUA+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX706TCUA+T meets industry standards.
7.What is the process for return or replacement of MAX706TCUA+T?
All MAX706TCUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX706TCUA+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX706TCUA+T part is unused and in its original packaging.
Return procedure for MAX706TCUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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